Digital Playback Comparison


Which sounds better: Original CD, CD burned from harddrive, playback from computer HD through USB, or optic cable, or Airport Express? I cleaned my contacts, installed NOS Amperex tubes in my preamp, had new tubes installed in my Trivista SACD/CD player, and had a go at a comparison test for these playback methods. The HD used was from my MacBook Pro. The piece of music used for a comparison was the Hallelujah chorus from Handel's Messiah, Solti and the Chicago Symphony Orchestra and Chorus (Decca 1985). See my system for equipment used. The USB playback was via a HagUSB via S/PDIF into the Trivista coax input. Here are the conclusions, going from best to least good sound quality:

1. (Tie): HagUSB and Burned CD (CD was burned from HD at 4x, from Apple Lossless file). I couldn't tell a difference between these two after extended listening including other music besides the test music. Great dynamic range, wide and deep soundstage, a "rightness" to the sound (at least within the limitations of digital) that made you want to quit analyzing and just listen.
2. Original CD. I read somewhere recently (some of you might know the source) that there is an explaination for why burned CD's sound better than original, but until I made the comparison, I was skeptical. The original had a slight loss of "presence", and seemed slightly compressed compared to the #1 playback methods.
3. HD through toslink. 1 & 2 are closer in sound than 2 & 3. There is a noticable shrinking of the soundstage and air with the optic cable. The cable is a good one--Van den Hull glass cable with mini-plug out from Mac. I was disappointed in the sound from this method.
4. Airport Express and optic. A significant drop in sound quality here. If you have been using this method I suggest doing what I will now do which is run USB out of computer to HagUSB ($119) via long run of coax (Canare for me) to your DAC. The Airport Express is OK for "working around the house on the weekend" listening, but is a serious compromise from what you can get with only a minimal incremental investment.

Notably absent from this comparison are music servers, or a good quality USB DAC, or good reclocker/converters that could be used with a computer HD and conventional DAC. Hopefully someone else can do comparisons of the burned CD with some of these methods to see what is the best sound for, let's say, a $2000 or less investment (obviously not including the cost of a computer). That is a level that many of us might be willing to make if there is a significant improvement over the #1 methods above.
bruce_1
Apparently, the CD burners burn the CDR disc more effectively (i.e., more easily read by the CDP) than the CD original was burned, and that allegedly accounts for the better sound. I'm not convinced. My feeling is that, like with everything Hi-End, each burner will have its own sound and sonic character, a frequency response that works very well in some systems, not so well in others, and that these differences will be the bases for the claims of superiority. I agree with those who say that a well made player with a well designed and built transport, laser, power supply, etc., are what we need to focus on for better sound. But if a burned disc sounds better to your ears in your system, and you've got the cash to invest in a full-blown audiophile-approved CDR burning system, then I say: go for it!
again, we are faced with the eternal question: what does better mean ? if it means i prefer a to b, then a is better, there is no definitive answer as to whether an original sounds better than a copy.

if better has a specific sonic denotation, then i would say the answer is that it is cd dependent.
Bruce_1, thanks for your thorough write-up of a comparison that is of great interest to me. I have a HagUSB unit on its way to me and I also have a MacBook Pro and an Airport Express. I will attempt to replicate your experiment with two additions: going through a Squeezebox3 and burning a CDR from an Alesis Masterlink 9600, which is a hard-drive CD burner, among other things.

For what it's worth, I have always been disappointed with CDs burned off my MacBook (ripping via Apple Lossless), which is why I bought the Alesis.
Drubin, I'll be very interested in the results of your test, particularly in adding the SB3 and Alexis into the mix. I've always burned CD's from my iMac and not my MacBook Pro, but just because I have my complete iTunes library on the LaCie HD hooked up to it and not the laptop. I might try comparing CD's burned on the two computers to see if I can tell a difference. According to some of the posts above there might be a difference in sound quality based on burner. We'll all be interested in your conclusions about the Alexis.
I ended up returning the Alesis, deciding it was not a product I needed in my rack. But I will report a huge difference between (1) Mac wirelessly -> SB3 -> DAC and (2) Mac via USB -> HagUSB -> DAC. The first scenario is like FM radio and the second like CD (although I have yet to compare to actual CD playback). In other words, the USB approach is a contender for serious listening, while the SB one is not. I was shocked at how much better the USB is.